We work with the lens makers – those who polish glass allowing wavelengths to bend, helping us to extend our sight.
or Magister Ludi or Das Glasperlenspiel is a (Nobel prize winning) novel by Hermann Hesse. It is also the key image in that novel: a game played by associating ideas around which an entire society is built.
In his last novel, The Glass Bead Game (1943), Hermann Hesse (1877–1962) regarded the seventeenth-century German philosopher and polymath Gottfried Wilhelm Leibniz (1646–1716) as one of the the precursors of the Glass Bead Game. The choice was perhaps even more appropriate than Hesse imagined. Both men yearned for utopias in which extraordinary machines would have a central role. The utopias differ. Leibniz’s, unlike Hesse’s, is an intensification and perfection of certain features of his world rather than a radical break with it; and his utopian machine
also known as switchable glass, dynamic glass, and smart-tinting glass is glass that changes its light transmission properties to prevent sunlight and heat from entering a building and/or provide privacy. Smart glass for building envelopes promises to create more energy-efficient building by reducing the amount of solar heat that passes through glass windows. wikipedia 
The glass envelope attached to the free end tilts as the coil expands and contracts.
Purdue had a PDP-9 behind glass on the ground floor of the electrical engineering building. It took me a while to discover that I was welcome to program it. I hung out there late at night with Bill Croft, a developer with a strong notion of style and a great influence on me at the time.
The CDC 6500 at Purdue occupied the basement of the then newish Math Science building. Batch job output appeared in bins along the hallway where one could look through glass at the computer itself. Across the hall was the consulting office where staff would help debug programs, usually by explaining error messages.
Sometimes in the morning when he shaved, he looked at his image in the glass and felt no identity with the face that stared back at him in surprise, the eyes clear in a grotesque mask; it was as if he wore, for an obscure reason, an outrageous disguise, as if he could, if he wished, strip away the bushy white eyebrows. —John Williams, Stoner
Consider the provision of an ordinary window. While a window is a standardized building commodity, the practices used to manufacture them have evolved dramatically from blast furnace and grinding to Pilkington’s float glass method. In other words, the way we make windows (the practice) has evolved but the window (the result of activity) remains roughly the same. Here we have independence of Practice and Activity. post
* Pilkington’s Float Glass Method page
We anticipate Tilt-Five's AR glasses will offer a superior viewing and interactive experience for any complex engineering model. Here we present a sequence of scripts we've built to explore this opportunity.